v7 man page for update

Query: update

OS: v7

Section: 8

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

UPDATE(8)						      System Manager's Manual							 UPDATE(8)

NAME
update - periodically update the super block
SYNOPSIS
/etc/update
DESCRIPTION
Update is a program that executes the sync(2) primitive every 30 seconds. This insures that the file system is fairly up to date in case of a crash. This command should not be executed directly, but should be executed out of the initialization shell command file.
SEE ALSO
sync(2), sync(1), init(8)
BUGS
With update running, if the CPU is halted just as the sync is executed, a file system can be damaged. This is partially due to DEC hard- ware that writes zeros when NPR requests fail. A fix would be to have sync(1) temporarily increment the system time by at least 30 seconds to trigger the execution of update. This would give 30 seconds grace to halt the CPU. UPDATE(8)
Related Man Pages
sync(8) - linux
sync(8) - redhat
sync(8) - suse
update-rcconf-guide(8) - sunos
update-rcconf-guide(8) - netbsd
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